It has become a consensus that the only way for electronic design is digitalization. On the road of digitization, my country’s electronic technology has undergone a series of major changes. The following is the main content of the EDA technology compiled by the editor. I hope you read it carefully!
The concept of EDA technology: EDA is the abbreviation of Electronic Design Automation (E1echonics Des5p AM·toM60n). Since it is a new technology that has just been developed, it covers a wide range of areas, is rich in content and has different understandings, so there is still no exact definition. However, from the perspective of several main aspects of EDA technology, it can be understood as follows: EDA technology takes large-scale programmable logic devices as the design carrier, hardware description language as the main expression of system logic description, and uses computer, large-scale The development software and experimental development system of programmable logic devices are design tools, and through the relevant development software, it is a new technology to automatically complete the design of electronic systems to hardware systems by software. It can realize logic compilation, logic simplification, logic segmentation, logic synthesis and optimization, logic layout and routing, and logic simulation. Completing the adaptation compilation, logic mapping, programming download and other work for a specific target chip, and finally forming an integrated electronic system or a dedicated integrated chip. EDA technology has been developed along with the design of computers, integrated circuits and electronic systems, and has been in development for more than 30 years. It can be roughly divided into three stages of development. The CAD (computer-aided design) stage in the 1970s: The main feature of this stage is the use of computer-aided editing of circuit schematics, and PCB layout and wiring, which frees designers from the traditional highly repetitive and complicated drawing labor. The QtE (Computer Aided Engineering Design) stage in the 1980s: The main features of this stage are logic simulation, timing analysis, fault simulation, automatic layout and routing as the core, focusing on solving problems such as functional detection of circuit design, making the design more efficient. The function and performance of the product can be predicted before the product is made. The 20th century is the EDA (Electronic Design Automation) stage: the main features of this stage are high-level description language, system-level simulation and comprehensive technology, and the “top-down” design concept is adopted. Many high-level designs are done by EDA tools. EDA is electronic technology design automation, that is, a software tool that can help people design electronic circuits or systems. The tool can work at various design stages of electronic products, making it possible to design more complex circuits and systems. In the schematic design stage, you can use the simulation tool in EDA to demonstrate the correctness of the design; in the chip design stage, you can use the chip design tool in EDA to design and manufacture the version of the chip In the circuit board design stage, you can use the EDA circuit board design Tool to design multilayer circuit boards. In particular, the emergence of EDA tools that support hardware description language makes it possible to automate the design of complex digital systems. As long as the behavior of the digital system is correctly described by the hardware description language, the chip design and manufacture of the digital system can be carried out. Some experts believe that the 21st century will be a period of rapid development of four-A technology, and EDA technology will be one of the top ten technologies that will have a significant impact on the 21st century.
The basic characteristics of EDA technology: EDA represents the latest development direction of today’s electronic design technology. Using EDA tools, electronic designers can design electronic systems from concepts, algorithms, protocols, etc., and a lot of work can be done through computers. The whole process from circuit design, performance analysis to designing IC layout or PCB layout is automatically processed on the juice computer. The design method adopted by the designer is a new high-level “top-down” design method. This design method starts with the system designer, and then divides the functional block diagram and designs the structure at the top level. Simulation, at the block diagram level. And use the hardware description language to describe the high-level system behavior, and carry out the driving license at the system level. Then, a netlist of specific gate circuits is generated with a comprehensive optimization tool, and its corresponding physical implementation level can be a printed circuit board or an application-specific integrated circuit (ASIC). The designer’s work is limited to the way of using software, that is, using hardware description language and EDA software to complete the realization of system hardware functions. Since the main simulation and debugging process of the design is completed at a high level, it is not only conducive to early detection of structural design errors, avoiding waste of design work, but also reducing the workload of logic function simulation and improving the one-time design. Success rate. Due to the increasing complexity and integration of modern electronic products, the general separation of small and medium-scale integrated circuits can no longer meet the requirements. High-speed, low-power programmable IC devices have flourished. The large-scale and ultra-large-scale chips used in EDA technology are called programmable ASIC chips. These programmable logic devices have experienced several development stages of CPm, IzPGA, CPLD, and FPGA since the 1970s. Logic device) / IzPGA (Field Programmable Logic Device) shoulder high-density programmable logic device, the current integration level has reached more than 2 million gates / chip, it will mask the advantages of high integration of ASIC and the convenience of programmable logic device design and production Combined with the characteristics of the product, it is especially suitable for sample development or small batch product development, so that the product can be marketed at the fastest speed, and when the market expands, it can easily be realized by mask ASIC, so the development risk is also large to reduce. It can be said that CPLE)/FPGA devices have become the realization of modern high-level electronic design methods. Hardware Description Language (HDL) is an important part of EDA technology and a very important software tool in EDA design and development. VHDL is the hardware description language for ultra-high-speed integrated circuits, which is still the mainstream hardware description language for electronic design. It has strong circuit description and modeling capabilities, and can model and describe digital systems from multiple levels, which greatly simplifies hardware design tasks and improves design consistency and reliability. A great advantage of design is that the designer can concentrate on the realization of its function without spending too much time and energy on process-related factors that do not affect the function. For example, a 32-bit adder needs to input 500 to 1 gates using graphic input software, but only needs to write a line of “A=B+C” in VHDL language. Using hardware description language (HDL), the description and debugging of electronic circuit characteristics, which must be designed and produced before, can be completed by means of simulation. Possible errors and problems can be found at the system behavior level, and repeated revisions and demonstrations can be made to avoid physical-level device damage and multiple fabrications, save time and development costs, and shorten the development cycle of electronic systems. Comparing the EDA technology with the traditional electronic design method, it can be seen that the traditional digital system design can only be designed on the circuit board, which is a building block method, which makes the design and debugging of complex circuits very difficult; if a certain There is an error in the process. It is very inconvenient to find and modify; for integrated circuit design, the design implementation process is directly related to the specific production process, so the portability is poor; only after the prototype is designed or the chip is produced, the actual swimming can be carried out, so the product development cycle is long. The electronic EDA technology is very different, using programmable devices, through the design of chips to achieve system functions. Using the hardware description language as the design input and the introduction of the library (LibraIy), the designer defines the internal logic and pins of the device, and most of the work originally done by the circuit board design is carried out in the chip design. Due to the flexibility of pin definition, the workload and difficulty of circuit diagram design and circuit board design are greatly reduced, the design flexibility is effectively enhanced, and the work efficiency is improved. In addition, the number of chips can be reduced, the system volume can be reduced, the energy consumption can be reduced, and the performance and reliability of the system can be improved. It can fully utilize the computer to automatically design, simulate and debug.
Hardware Description Language: Hardware Description Language (HDL) is a high-level computer language used for electronic system hardware design. It uses software design methods to describe the logic function, circuit structure and connection form of electronic systems. Hardware description language can describe circuits at three levels, which are divided into behavior level, R, several levels and gate circuit level from high to low. Commonly used hardware description languages are WDL, Velllq and AHDL languages. WDL language is a high-level description language, suitable for behavior-level and R, several-level description; Vedlq language and ABEL language belong to a lower-level description language, suitable for R, several-level and gate-level description. Now WDL and Velllq, as industry standard hardware description languages, have been supported by many EDA companies. In the field of electronic engineering, they have become the de facto general hardware description languages and undertake almost all the design tasks of digital systems. The application of Vf for electronic system design has the following advantages: (1) Compared with other hardware description languages, WDL has stronger behavior description ability. The powerful behavior description ability is to avoid specific device structures and describe and design from logical behavior. Important guarantee for large-scale electronic systems. (2) VHDL has rich simulation statements and library functions, which makes it possible to check the functional feasibility of the designed system in the early stage of the design of any large system, and to simulate the system at any time. (3) The behavior description ability and program structure of the Vf statement determine that it has the function of supporting large-scale design decomposition and reuse of existing designs. (4) The design completed with Vf can use EDA tools for logic synthesis and optimization, and can automatically convert the Vf description design into a gate-level netlist according to different target chips, which greatly reduces the circuit design time. and possible errors, thereby reducing development costs. (5) Vf0L has a relatively independent description of the design, and can carry out an independent design without the designer’s rigid hardware structure and without caring what the target device of the final design is. (6) Since VI has functions such as generic description statements and subroutine calls, the completed design can be easily changed and calculated by changing the generic parameters or functions without changing the source program. size and structure.
Application of EDA technology: Electronic EDA technology has developed rapidly and gradually played a huge role in teaching, scientific research, product design and manufacturing. In terms of teaching: almost all science and engineering (especially electronic information) colleges and universities have opened EDA courses. The main purpose is to let students understand the basic principles and concepts of EDA, the method of describing system logic with L, and the simulation experiment of electronic circuit courses by using the A tool, and to engage in the design of simple electronic systems in the graduation design. Lay the foundation for future work. It is representative that the country holds a college student electronic design competition every two years. In scientific research: mainly use circuit simulation tools (EwB or PSPICE, VLOL, etc.) for circuit design and simulation; use virtual instruments for product debugging; apply the development of O)LI)/FPGA devices to instruments and equipment. For example, in a CDMA wireless communication system, all mobile phones and wireless base stations work in the same frequency spectrum. In order to distinguish different calls, each mobile phone has a unique code sequence. The CDMA base station must be able to distinguish these code sequences from different viewpoints. Distinguish different paging processes; this judgment is to detect a specific code sequence in the input data stream through the output of the matched filter; FPGA can provide good filter design, and can complete DSP advanced data processing functions, Therefore, FPGA is widely used in the field of modern communication. In terms of product design and manufacturing: from high-performance microprocessors, digital signal processors to color TVs, audio and electronic toy circuits, etc., EDA technology is not only used in early computer simulation and product debugging, but also in P It plays an important role in the production of electronic equipment, the development and production of electronic equipment, the welding of circuit boards, and the production process of Pongbi. It can be said that electronic EDA technology has become an indispensable technical support in the field of electronic industry.
Development trend of EDA technology: After EDA technology entered the 21st century, due to the continuous introduction of larger-scale FPGA and concave m devices, powerful EDA software supporting standard hardware description language in both simulation and design has been continuously updated and increased, making Electronic EDA technology has been further developed. Electronic technology is fully integrated into the field of EDA. EDA makes the boundaries of various disciplines in the field of electronics more blurred and mutually inclusive. It is highlighted in the following aspects: it is possible to clearly express and confirm electronic design results in the form of independent intellectual property rights; The ASIC design standard unit based on EDA tools has covered large-scale electronic systems and IP core modules; the software and hardware IP cores have been further confirmed in the industrial field, technical field and design application field of the electronics industry; SoC high-efficiency and low-cost design technology is mature. With the rapid development of semiconductor technology, integration technology and computer technology, the design methods and design methods of electronic systems have undergone great changes. It can be said that electronic EDA technology is a revolution in the field of electronic design. The traditional “fixed-function integrated block ten-wire” design method is gradually withdrawing from the historical stage, and the chip-based design method is becoming the mainstream of modern electronic system design. As the students of relevant majors in colleges and universities and the majority of electronic engineers, it is imperative to understand and grasp this advanced technology. This is not only the need to improve design efficiency, but also the needs of the development of the times. Only by grasping the EDA technology can Only those who have the ability to participate in the competition in the world electronics industry market can survive and develop. With the advancement of science and technology, the update of electronic products is changing with each passing day. As the source power of electronic product development, EDA technology has become the core of modern electronic design. Therefore, the development of EDA technology will be a major technological revolution in the field of electronic design and the electronic industry, and it will also put forward deeper and higher requirements for the teaching and research of electrical courses. In particular, EDA technology has not yet been popularized in our country. Mastering and popularizing this brand-new technology will have far-reaching significance for the development of electronic technology in our country.
As an electronic hardware engineer, a college student majoring in electronics, or an electronics enthusiast, you must master EILA technology for the development of 0U)/5PGA. Only in this way can you take the express train of modern technology to adapt to the fiercely competitive environment. . At present and in the future, EDA technology is mainly used in the following aspects: 1. In the practical teaching of electronic majors in colleges and universities, such as experimental teaching, course design, graduation design, design competition, etc., concave ID/5PGA devices can be used, even if The experimental equipment or the designed electronic system has high reliability, is economical, fast, easy to implement, and convenient to modify. At the same time, it can greatly improve the students’ practical ability, innovation ability and computer application ability. 2. In scientific research and new product development, 0)U)/5PGA can be directly applied to chips of small batches or pre-development of chips of large batches. The upgrading and technological transformation of traditional electromechanical products, the application of 0)U)/5PGA can improve the performance of traditional products, reduce the volume, improve the technical content and the added value of products.